If you changed your mobile phone number but you did not change your smartphone device, you do not need to reactivate your IBKR Mobile Authentication (IB Key).
Additional Information
Do I need to reactivate IBKR Mobile authentication if my phone number has changed?
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How do I use two-factor IBKR Mobile Authentication?
Information and procedures related to security devices
How do I replace a malfunctioning or lost physical security device?
I am a Full Service Broker, can I activate IBKR Mobile Authentication (IBKey)?